Patents by Inventor Kazufumi Omura

Kazufumi Omura has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 10538670
    Abstract: Provided are a pigment dispersion liquid including a pigment, a polymer dispersant, and water; and an inkjet ink containing the pigment dispersion liquid. The pigment contains a compound represented by General Formula (1) described in the specification, a tautomer thereof, or a salt of the compound or the tautomer. The polymer dispersant contains a polymer compound which has a repeating unit represented General Formula (2-1) and a repeating unit represented General Formula (2-2) described in the specification, and having a structure represented by General Formula (3) introduced into at least one terminal of a main chain: in General Formula (3), L represents a linking group; R4 represents a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, or a substituted or unsubstituted heterocyclic group; and the symbol * represents a linking bond.
    Type: Grant
    Filed: January 18, 2019
    Date of Patent: January 21, 2020
    Assignee: FUJIFILM Corporation
    Inventors: Shinya Hayashi, Yoshiaki Nagata, Kazufumi Omura, Kazushi Furukawa, Keiichi Tateishi
  • Publication number: 20190153231
    Abstract: Provided are a pigment dispersion liquid including a pigment, a polymer dispersant, and water, in which the pigment is a pigment including a compound represented by General Formula (1) as described in the specification, a tautomer thereof, or a salt of the compound or the tautomer, and the polymer dispersant includes a polymer compound having a repeating unit represented by General Formula (2-1) and a repeating unit represented by General Formula (2-2) as described in the specification, and having a structure represented by General Formula (3) introduced into at least one terminal of the main chain; and an inkjet ink including this pigment dispersion liquid. In General Formula (3), L represents a linking group; R4 represents a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, or a substituted or unsubstituted heterocyclic group; and the symbol * represents a linking bond.
    Type: Application
    Filed: January 18, 2019
    Publication date: May 23, 2019
    Applicant: FUJIFILM Corporation
    Inventors: Shinya HAYASHI, Yoshiaki NAGATA, Kazufumi OMURA, Kazushi FURUKAWA, Keiichi TATEISHI
  • Patent number: 10096333
    Abstract: An aspect of the present invention relates to a magnetic recording medium, which comprises a nonmagnetic layer comprising nonmagnetic powder and binder on a nonmagnetic support, and a magnetic layer comprising ferromagnetic powder and binder on the nonmagnetic layer, wherein the magnetic layer further comprises carbon black, and a state in which the carbon black is present, as observed in a reflection electron image of a surface of the magnetic layer obtained by a scanning electron microscope, satisfies condition 1 and condition 2 below: condition 1: a number of carbon black particles with a particle size of greater than or equal to 140 nm is greater than or equal to 30 per 1,000 ?m2 of area; and condition 2: a number of carbon black particles with a particle size of greater than or equal to 220 nm is less than or equal to 10 per 1,000 ?m2 of area.
    Type: Grant
    Filed: June 30, 2015
    Date of Patent: October 9, 2018
    Assignee: FUJIFILM Corporation
    Inventors: Yoshinori Tamada, Masahide Sato, Kazufumi Omura
  • Patent number: 10090013
    Abstract: An aspect of the present invention relates to binder for a magnetic recording medium, which is vinyl chloride resin comprising at least one side chain, the side chain comprising at least one urethane bond and at least one monovalent sulfur-containing substituent denoted by formula (1): —S-A-Z??(1) wherein, in formula (1), A denotes a divalent connecting group which may comprise one or more active hydrogen groups and Z denotes an active hydrogen group.
    Type: Grant
    Filed: March 27, 2015
    Date of Patent: October 2, 2018
    Assignee: FUJIFILM Corporation
    Inventor: Kazufumi Omura
  • Patent number: 9959894
    Abstract: The magnetic tape comprises a nonmagnetic layer comprising nonmagnetic powder and binder on a nonmagnetic support, and comprises a magnetic layer comprising ferromagnetic powder and binder on the nonmagnetic layer, wherein a fatty acid ester, a fatty acid amide, and a fatty acid are contained in either one or both of the magnetic layer and the nonmagnetic layer, with the magnetic layer and nonmagnetic layer each comprising at least one selected from the group consisting of a fatty acid ester, a fatty acid amide, and a fatty acid, a quantity of fatty acid ester per unit area of the magnetic layer in extraction components extracted from a surface of the magnetic layer with n-hexane falls within a range of 1.00 mg/m2 to 10.
    Type: Grant
    Filed: September 30, 2015
    Date of Patent: May 1, 2018
    Assignee: FUJIFILM Corporation
    Inventor: Kazufumi Omura
  • Patent number: 9514776
    Abstract: The method of manufacturing hexagonal ferrite magnetic particles includes providing hexagonal ferrite magnetic particles by conducting calcination of particles comprising an iron salt and an alkaline earth metal salt to cause fertilization; and further includes preparing the particles comprising an iron salt and an alkaline earth metal salt by adhering a glass component, followed by the alkaline earth metal salt, to the iron salt; and conducting calcination of the particles prepared to form a calcined product in which hexagonal ferrite is detected as a principal component in X-ray diffraction analysis.
    Type: Grant
    Filed: December 2, 2013
    Date of Patent: December 6, 2016
    Assignee: FUJIFILM Corporation
    Inventors: Yasushi Hattori, Kazufumi Omura
  • Patent number: 9382130
    Abstract: The method of manufacturing hexagonal ferrite magnetic particles, which includes providing hexagonal ferrite magnetic particles by conducting calcination of particles comprising an alkaline earth metal salt and an iron salt to cause ferritization; and further includes causing a glass component to adhere to the particles and then conducting the calcination of the particles to form a calcined product in which hexagonal ferrite is detected as a principal component in X-ray diffraction analysis; and removing the glass component from a surface of the calcined product that has been formed.
    Type: Grant
    Filed: September 27, 2013
    Date of Patent: July 5, 2016
    Assignee: FUJIFILM Corporation
    Inventors: Yasushi Hattori, Kazufumi Omura
  • Patent number: 9376524
    Abstract: The composition is a composition for forming a thermally-cured coating film, and comprises polyurethane resin comprising at least one group selected from the group consisting of a methacryloyloxy group, an acryloyloxy group, a methacryloyl group, and an acryloyl group; polythiol; and solvent.
    Type: Grant
    Filed: March 27, 2014
    Date of Patent: June 28, 2016
    Assignee: FUJIFILM Corporation
    Inventor: Kazufumi Omura
  • Patent number: 9311949
    Abstract: An aspect of the present invention relates to a method of manufacturing magnetic powder, which comprises adding an alkali metal salt compound comprising a substituent selected from the group consisting of an alkali metal salt of a carboxyl group and an alkali metal salt of a hydroxyl group to a water-based magnetic liquid comprising magnetic particles dispersed in an acidic water-based solvent to cause the magnetic particles to aggregate in the water-based magnetic liquid; and collecting the aggregated magnetic particles to obtain the magnetic powder.
    Type: Grant
    Filed: June 30, 2015
    Date of Patent: April 12, 2016
    Assignee: FUJIFILM Corporation
    Inventors: Kazufumi Omura, Masahiko Mori
  • Publication number: 20160093323
    Abstract: The magnetic tape comprises a nonmagnetic layer comprising nonmagnetic powder and binder on a nonmagnetic support, and comprises a magnetic layer comprising ferromagnetic powder and binder on the nonmagnetic layer, wherein a fatty acid ester, a fatty acid amide, and a fatty acid are contained in either one or both of the magnetic layer and the nonmagnetic layer, with the magnetic layer and nonmagnetic layer each comprising at least one selected from the group consisting of a fatty acid ester, a fatty acid amide, and a fatty acid, a quantity of fatty acid ester per unit area of the magnetic layer in extraction components extracted from a surface of the magnetic layer with n-hexane falls within a range of 1.00 mg/m2 to 10.
    Type: Application
    Filed: September 30, 2015
    Publication date: March 31, 2016
    Applicant: FUJIFILM CORPORATION
    Inventor: Kazufumi OMURA
  • Publication number: 20150380037
    Abstract: An aspect of the present invention relates to a magnetic recording medium, which comprises a nonmagnetic layer comprising nonmagnetic powder and binder on a nonmagnetic support, and a magnetic layer comprising ferromagnetic powder and binder on the nonmagnetic layer, wherein the magnetic layer further comprises carbon black, and a state in which the carbon black is present, as observed in a reflection electron image of a surface of the magnetic layer obtained by a scanning electron microscope, satisfies condition 1 and condition 2 below: condition 1: a number of carbon black particles with a particle size of greater than or equal to 140 nm is greater than or equal to 30 per 1,000 ?m2 of area; and condition 2: a number of carbon black particles with a particle size of greater than or equal to 220 nm is less than or equal to 10 per 1,000 ?m2 of area.
    Type: Application
    Filed: June 30, 2015
    Publication date: December 31, 2015
    Applicant: FUJIFILM CORPORATION
    Inventors: Yoshinori TAMADA, Masahide SATO, Kazufumi OMURA
  • Patent number: 9202502
    Abstract: An aspect of the present invention relates to a method of manufacturing magnetic particles, which comprises adding a carboxylic acid compound to a water-based magnetic liquid, wherein the water-based magnetic liquid comprises magnetic particles dispersed in an acidic water-based solvent, and the carboxylic acid compound is selected from the group consisting of aromatic compounds and aliphatic compounds having one or more carboxylic acid (salt) groups denoted by: —COOM wherein M denotes a hydrogen atom or an alkali metal atom, when the number of the carboxylic acid (salt) group contained within the molecule thereof is 1, the number of carbon atoms, excluding the carboxylic acid (salt) group portion, ranges from 1 to 13; and then collecting the magnetic particles from the water-based magnetic liquid to obtain the magnetic particles the surfaces of which have been modified by being coated with the carboxylic acid compound.
    Type: Grant
    Filed: December 26, 2012
    Date of Patent: December 1, 2015
    Assignee: FUJIFILM Corporation
    Inventors: Kazufumi Omura, Masahiko Mori
  • Patent number: 9177584
    Abstract: An aspect of the present invention relates to a method of manufacturing a vinyl polymer, which comprises: mixing a first liquid and a second liquid to conduct an addition reaction, wherein the first liquid has been obtained by reacting a sulfonic acid group-containing compound selected from the group consisting of taurine, N-methyl taurine, and meta-aminobenzenesulfonic acid with an alkali metal hydroxide in methanol, the second liquid comprises a vinyl polymer having an intramolecular epoxy group in a ketone solvent, and the addition reaction incorporates a sulfonic acid alkali metal salt group onto a side chain of the vinyl polymer.
    Type: Grant
    Filed: May 18, 2012
    Date of Patent: November 3, 2015
    Assignee: FUJIFILM Corporation
    Inventor: Kazufumi Omura
  • Publication number: 20150302880
    Abstract: An aspect of the present invention relates to a method of manufacturing magnetic powder, which comprises adding an alkali metal salt compound comprising a substituent selected from the group consisting of an alkali metal salt of a carboxyl group and an alkali metal salt of a hydroxyl group to a water-based magnetic liquid comprising magnetic particles dispersed in an acidic water-based solvent to cause the magnetic particles to aggregate in the water-based magnetic liquid; and collecting the aggregated magnetic particles to obtain the magnetic powder.
    Type: Application
    Filed: June 30, 2015
    Publication date: October 22, 2015
    Applicant: FUJIFILM Corporation
    Inventors: Kazufumi OMURA, Masahiko MORI
  • Publication number: 20150279405
    Abstract: An aspect of the present invention relates to binder for a magnetic recording medium, which is vinyl chloride resin comprising at least one side chain, the side chain comprising at least one urethane bond and at least one monovalent sulfur-containing substituent denoted by formula (1): —S-A-Z??(1) wherein, in formula (1), A denotes a divalent connecting group which may comprise one or more active hydrogen groups and Z denotes an active hydroxyl group.
    Type: Application
    Filed: March 27, 2015
    Publication date: October 1, 2015
    Applicant: FUJIFILM CORPORATION
    Inventor: Kazufumi OMURA
  • Publication number: 20150248908
    Abstract: An aspect of the present invention relates to a magnetic recording medium comprising a nonmagnetic layer comprising a nonmagnetic powder and a binder and a magnetic layer comprising a ferromagnetic powder and a binder in this order on a nonmagnetic support, wherein the magnetic layer and/or nonmagnetic layer comprises organic acid A and organic acid B below, with an acid strength pKa(A) of organic acid A and an acid strength pKa(B) of organic acid B satisfying a relation of pKa(A)<pKa(B); organic acid A: an unsaturated bond-containing organic acid comprising one substituent selected from the group consisting of a carboxyl group, a phosphoric acid group, and a phosphonic acid group per molecule; organic acid B: an aliphatic or alicyclic organic acid in which two or more substituents substituted onto adjacent carbon atoms within the molecule are present per molecule, and at least one of the substituents is a carboxyl group.
    Type: Application
    Filed: April 29, 2015
    Publication date: September 3, 2015
    Applicant: FUJIFILM Corporation
    Inventors: Yohei ARITOSHI, Kazufumi OMURA
  • Patent number: 9117581
    Abstract: An aspect of the present invention relates to a method of manufacturing magnetic powder, which comprises adding an alkali metal salt compound comprising a substituent selected from the group consisting of an alkali metal salt of a carboxyl group and an alkali metal salt of a hydroxyl group to a water-based magnetic liquid comprising magnetic particles dispersed in an acidic water-based solvent to cause the magnetic particles to aggregate in the water-based magnetic liquid; and collecting the aggregated magnetic particles to obtain the magnetic powder.
    Type: Grant
    Filed: October 26, 2012
    Date of Patent: August 25, 2015
    Assignee: FUJIFILM Corporation
    Inventors: Kazufumi Omura, Masahiko Mori
  • Patent number: 9099141
    Abstract: An aspect of the present invention relates to a radiation-curable vinyl chloride resin composition comprising a vinyl chloride resin containing a radiation-curable functional group, and/or starting material compounds thereof, as well as a benzoquinone compound.
    Type: Grant
    Filed: July 30, 2010
    Date of Patent: August 4, 2015
    Assignee: FUJIFILM Corporation
    Inventors: Katsumi Araki, Kazufumi Omura
  • Patent number: 9076478
    Abstract: An aspect of the present invention relates to a binder resin composition for a magnetic recording medium, which comprises a vinyl chloride resin containing a radiation-curable functional group, and a methacrylate compound denoted by formula (A): in an amount of equal to or more than 0.3 weight percent but equal to or less than 10 weight percent relative to a content of the vinyl chloride resin.
    Type: Grant
    Filed: January 11, 2012
    Date of Patent: July 7, 2015
    Assignee: FUJIFILM Corporation
    Inventor: Kazufumi Omura
  • Patent number: 9047904
    Abstract: An aspect of the present invention relates to a magnetic recording medium comprising a nonmagnetic layer comprising a nonmagnetic powder and a binder and a magnetic layer comprising a ferromagnetic powder and a binder in this order on a nonmagnetic support, wherein the magnetic layer and/or nonmagnetic layer comprises organic acid A and organic acid B below, with an acid strength pKa(A) of organic acid A and an acid strength pKa(B) of organic acid B satisfying a relation of pKa(A)<pKa(B); organic acid A: an unsaturated bond-containing organic acid comprising one substituent selected from the group consisting of a carboxyl group, a phosphoric acid group, and a phosphonic acid group per molecule; organic acid B: an aliphatic or alicyclic organic acid in which two or more substituents substituted onto adjacent carbon atoms within the molecule are present per molecule, and at least one of the substituents is a carboxyl group.
    Type: Grant
    Filed: March 30, 2010
    Date of Patent: June 2, 2015
    Assignee: FUJIFILM Corporation
    Inventors: Yohei Aritoshi, Kazufumi Omura